Sifting apparatus.



W. LINDSAY.

SITING APARATUS.

@YL-rumah' rum APF.A e, 1914` Patented Dec. 15, 1914 2 sHEnTssHnzT 1.

Patented Dec, l5, 1914.

2 SHESYISVv "Zf'bf/ W. LINDSAY. SIFTING APPARATUS.

APPLICATION FILED APR, 9* 1914.

4bolts 24.

the vibrator, s0 as to coincide with the two opposite corners thereof, ii said wires are so placed :is to lie in planes at angles ebstantially forty iiie degrees from tl if. itl vibrator, as Yl pieter to haie them pianeti.

4 in .i if and l. i have shoan the normal relati-.o ol' the wires Aforming the screen. ln Fig. l the circle represents diagrammatically the walls of th-c receptacle when in its normal state, while Fig. 5, shows it distoited. or in the form ot' an ellipse with a corresponding distortion, necessarily greatly exaififeraietl in degree, of the contour or shape el the meshes ot the screen, which die tortion occurs with each attraction el the magnets, and the corresponding bending ot' tff- AIront members il of the vibrator, the distorting mownient being horizontal or u h in the 'plane ot the screen instead ot rei-cat ln prat. l prefer to employ tor ver). iinc material a screen having` about two hui-,drwl meshes to the inch. lt follows therefore that the distortion ,in such a structure would not be perceptible to the eye. Nevertheless, .l have found it to be thorouglily cil'ectiye in practice.

ln Fig. b' l have shown a modified conv struction, in which all the parts are the same except those substituted for the partsA 1l, and hence the reference numerals are retained as' to all unchanged parts.

Extending across the receptacle, preferably in the plane ot' its diameter, is a bar 23, of spring metal, the ends of which are bent at right angles to the body and bolted to the walls of. the receptacle by means of magnet 17, having its poles pointing: upwardly is rigidly attached to the middle ot' said bar. supporting arm 25, has one end jointedly connected at 2t?, to any adjusting bolt E?. which passed through a bore in a lug ii'orn'ied upon the bracket 9. A n adjusting nut Bti, adapted to be locked by a set screw 26), enal; s said arm to be adjusted tor the purpose hereinafter stated. The arm is bent downwardly as shown and its lower end ar ranged to :est ioosely upon the bar ''ZS :it any arbitrary point between the middle and end of the bar. Said arm is notched. at its lower end lso as to straddle the bar 23 and prevent lateral displacement. The. magnet 1.3, is suspended beneath the arm 25, with its depending' poles in operative proximity to those of the magnet 17. The distance between the poles of the two magnets may be adjusted by means of the set screws 20. lVhen the magnets are excited the spring bar 23 is caused to bend and draw the walls of the receptacle toward each other to a proportionate degree, the action being the same in this respect as that ot the preferred construction. ln Aprac-.tice the distance between the opposing magnet poles should he such as to prevent them from touching when excited. Sach an adjustment @naties the best .results to be accoiipl hed i r itA ing puriV :ses while eliminating! wear and p; yenting an ump dit and iiriiiri i ii luation ol' the handle.

The current frequency' ma); he time@der-y ably lfaried in. order to conform to the char-l acter ol the material treated as well as the relative coarseness or Hoeness of the sieve. For a comparatiyely coarse sieve the cycles may run as low as twenty live per second, while with one of extreme fineness they may e'exeed one hundred. t should be understoigid that the extent oi' distortion of the sieve niesht would vary in. proportion to the frequency oi4 the cie ric iibrations; a low treduaicv giving :i greater. and a high trequency a lesser degree oi' distortion. This Feature should be taitenrinto account in connection with the relative finenessol the material to be treated.

l do not wish to be limited to any particular manner ot adjustil'ipr the magnets with reference to a. vibrator, nor do l wish to'be confined to electrical or nagnetic means for accomplishing this purpose inasmuch as any automatic means for rapidly bending the bar or bars to distort the meshes ot' the screen may be employed.

The walls of the receptacle may be made more or less elastic and hence it follows that the conn `cting members between them may be mere light bands, wires or tie rods. the bending of which may servo to distort the walls as described. Nor is it essential that these members should be placed diametrically so long as th l,y are trai'isverse to the body of the receptacle and arranged to cause a lateral distortion of the screen.

A peculiarly' distinguishing feature oi my device is that the sifting attion it used by a lateral distortion of the meshes in the plane of the screen instead of a substantially vertical vibration of the hitter. The objection to vertical Vibration is that there would bc a maximum movement at the center ot the screen and none at the edges, tliereby causing irregularityY in sifting, whereas, with the lateral distortion of the meshes the sitting is uniform throughout the entire surface, which is of the utmost importance for enameling purposes or for use in which uniformity is essential.

.Having thus described my invention, I claim:

l. A sitter having a reticulated screen, yielding means attached thereto for normally holding the mesh 'forming memlers thor-cot in predetermined angular relation to each other and mea-ns for rapidly distorting .said holding means to change the angular contemof the meshes.

2. .A sitter having a. reticulated screen, a Supporting frame for normally holding the means for drawing together and reusing Said Walls in rapid succession in panes oblique to those of ffm-ming memlims, Y

@L A. sftey umnprsmg u z ;-.f; tace hav-- ing :a iwwizrslaed satema Secured w in@ Wall :i Hausa l. mmzecmg nemvi rgfly mfzhad o 'd was in a, pzn 15m. pimms in which 1.35m sz'em; im. Hands am heated .and vbmim'y .Towns frfr rapidly bemmg said comlfactng; m impairt a vixratjf mmfelm-um; te; me said reyxace and :,hmeby dsfrirn du: meshes of smid ser# :sf aompxlgng a, reptace having a, nei. like sumen, the periphery of which a'tfmhed to the. walls ci? said i'fxreptaa, a spamming mambr nmfpsed between op lsmste uf .wid receptacle and means foi bending and reeang savf member in :rapid Succ m distal@ :lha .mls 0?' said refzepmde :md i, le 111525151533 Uf @aid een, A sl'r comprsng a receptacle b mg a semen scuzied iro the Wav' d: 1 imnmcting member nmfposifd bewiesen 75H5 Gf said recpncs, a. magnet in. opwa- 've proxilmty w mmnecting nwmbez and eectrial mmm ff mezmemy e siting :said a'mgrzstv- 'i said "wm '3'. l'scepmie i;

' f if zm@ ihn interwoven webh-l opposing magnets suppmte respectively by said connecting members and electriuai mmm im' inlcrmitemy excng sac mag mets whereby said cenmctng members may be ist in. "vibmtio yielding means for normally holding the wires thereof n grecge reaton to each Gibier o no'nmly .maintain the. meshes in a, predatermned form, yand means for Simultanaouy exeuig oppmsng forces in opchang-5. th@ Canton safaf .rf1e.hes and cause them i, unarmed m imx'mzu form.

y, ffufer having l mi dated semen,

fel-eut points up'i gndframe t0 vary ih'f': angular form of tbA @shag 0f said screen am? restare them tu zmfmal shapeA In tlestimuny whereaf, I hws. signed thm spac'cation in fh@ presence, of' tWOsubSf-,rbjug; witnesses? this 30th day of' March, i914, 

